Trigger Responsive Behavior on Height Detection as well as Width

In a custom user interface responsive project we are trying to figure out how to program a responsive reaction when the HEIGHT drops below 768. We have it working fine on the width and we get to our "laptop" breakpoint settings at 1024 width, but having trouble triggering the same breakpoint when the height goes below 769. Captivate itself does not have height breakpoints, but we're able to detect the browser window height and want to know how to trigger the breakpoint when it is a certain value. Hoping we can add that to the CPM.js file as we have added a number of functions using the cpAPI.